Coal-drill



UNITED STATES PATENT OFFICE.

VARREN C. JOHNSON, OF OSKALOOSA, IOVA.

COAL-DRILL.

SPECIFICATION forming part of Letters Patent. No. 391.157, dated October 16, 1888.

Application tiled March 30, 158:?. Serial No. 268,995.

To aZZ whom t may concer/ft:

Be it known that I, WARREN C. JOHNSON, of Oskaloosa, in the county of Mahaska and State of Iowa, have invented a new and useful Improvement in Coal-Drills, of which the following is a specication, reference being had to the annexed drawings, forming a part thereof, in which- Figure lis a side elevation of my improved coal'drill. Fig. 2 is a front elevation of the drill-frame with the drill proper removed; and Fig. 3 is a horizontal section taken on line x :v in Fig. 2.

Similar letters of reference indicate corresponding parts in all the views.

The object of my invention is to provide a coal-mining drill which lnay be clamped at any desired elevation by tightening a bolt.

My invention consists in the combination, with the sliding pieces ofa coal-drill, of a sleeve interposed between the sliding supports of the drilling apparatus and a bolt passing through the said sliding supports and through the sleeve and adapted to clamp the sliding supports against the side bars of the frame of the drill, all as hereinafter more fully described.

The frame A of the drill is formed of the side bars, a, clamped at the top to a distancepiece, b, carrying a retainingpoint, c, and at the bottom to a similar distanoe-piece, b', carrying an adjustable retaining-point, c. Upon the side bars, a, are loosely placed the sliding supports B of the trunnions d of the coaldrill C.

Between the sliding supports B is placed a (No model.)

sleeve, e, and in holes formed in the sliding supports B is inserted a bolt,f, which also passes through the sleeve e. The head of the bolt reaches over one of the vertical bars a, while the wing-nut g, received on the bolt, reaches over the other vertical bar, so that when the nutg is turned the vertical bars a will be clamped against the inner surfaces of the supports B, the said supports being in turn clamped upon the ends of the sleeve c.

The drill C is ofthe usual construction, and Will therefore need no special description.

Having thus described my invention,I claim as new and desire to secure by Letters Patent- 1. The combination, with the side bars, a, and sliding supports B, of the sleeve e, interposed between the sliding supports, and the boltf, passing through the sliding supports B and the sleeve e, and provided with a head and nuteXtending over the bars a a, substantially as specified.

2. A coal-drill formed of the vside bars, a, and their supports, the drillO, provided with trunnions d, the sliding supports B, fitted to the bars a, and adapted to support the trunnions d, the sleeve e, and the boltf, passing through the sliding supports B and sleeve e and adapted to clamp the bars a, sliding supports B, and sleeve e together, substantially as specified.

VARREN C. JOHNSON.

Vitnesses:

L. H. CORYELL, FRANK. M. DAVIS. 

